Knurled Screw Mufflers | McMaster-Carr

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Flow Rate @ 100 psi

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8 Products

Flow-Control Mufflers

Adjust the flow by turning the screw. Use these mufflers with air-powered tools and cylinders to reduce noise and filter exhaust fumes.

Mufflers with Thumb Screw

NPT

Bronze

with

Thumb

Screw

For mufflers with a thumb screw, twist the screw and friction secures them in place—no need to use a wrench. Often used in valve exhaust ports, these mufflers are not as secure as those with a nut.

											Each
	Pipe Size	Max. Flow Rate @ Pressure	Max. Pressure, psi	Max. Temp., ° F	Ht.	For Use With	Removes Particle Size Down To, μm	Noise Reduction Rating, dBA	Features		1-19	20-Up
NPT Male Bronze Fitting



		1/8	6 scfm @ 100 psi	215	570	1 1/16"	Air, Inert Gas	35	17 to 20	Adjustable Airflow, Friction Lock	0000000	00000	00000


		1/8	6 scfm @ 100 psi	215	570	1 3/8"	Air, Inert Gas	35	17 to 20	Adjustable Airflow, Friction Lock	0000000	0000	0000
		1/4	9 scfm @ 100 psi	215	570	1 3/16"	Air, Inert Gas	35	17 to 20	Adjustable Airflow, Friction Lock	0000000	0000	0000
		1/4	9 scfm @ 100 psi	215	570	1 9/16"	Air, Inert Gas	35	17 to 20	Adjustable Airflow, Friction Lock	0000000	0000	0000

Air-Exhaust Flow Control Valves


Thumb Screw Flow Adjustment

Install these valves in the exhaust ports of air directional control valves to control exhaust air speed without needing access to your cylinder. They control flow in one direction as air moves from the inlet to the exhaust port (meter out). Air flows freely in the opposite direction. Valves exhaust to the atmosphere and include a muffler to reduce the exhaust noise.

Flow Coefficient (Cv)—Flow coefficient (Cv) is a measurement that indicates how much airflow can pass through a valve. When selecting between valves with the same port size, choose the valve with the higher flow coefficient to ensure it provides enough airflow to operate your system.

								Overall, mm
	No. of Flow Ports	Inlet Size	Max. Flow Rate @ Pressure	Flow Coefficient (Cv)	Max. Pressure, psi	Body Material	Hex Size, mm	Dia	Lg.		Each
Threaded Male Inlet







				Flow-Adjustment Thumb Screw

				2	1/8 BSPT	10.59 scfm @ 100 psi	0.201	145	Brass	10	14	35.8	00000000	000000


				2	1/4 BSPT	17.66 scfm @ 100 psi	0.313	145	Brass	14	18	37	00000000	00000
				2	M5 Metric	3.35 scfm @ 100 psi	0.06	145	Brass	8	10	23.4	00000000	00000
				2	M7 Metric	4.24 scfm @ 100 psi	0.075	145	Brass	8	10	26.9	00000000	00000